//  top.js
//    Shows random image picture on the top page.
//    Copyright (C) 2007, Zootique Co., Ltd. All rights reserved.

//  定数初期設定
var maxImgNum = 50;
var imgObjId = "TopPageImgPic";
var imgPath = "/images/imgpics/";
var imgFileNameCore = "imgpics";
var imgFileNameExt = ".jpg";

//  イメージ差し替え
function setRandomImagePics(){
  var imgNum, imgNumStr, imgObj;
  imgNum = Math.floor( Math.random() * maxImgNum + 1);
  imgNumStr = sprintf( "%0.4d", imgNum );
  imgObj = document.getElementById( imgObjId );
  imgObj.src = imgPath + imgFileNameCore + imgNumStr + imgFileNameExt;
}